code: def test_get_output_for_notimplemented(self, layer):
      with pytest.raises(NotImplementedError):
          layer.get_output_for(Mock())
  
imports: from mock import Mock
  import numpy
  import pytest
  import theano
label_desc: Use image node_id 7 for calling the TestMergeLayer obj's underlying member method code with example usage: obj.test_get_output_for_notimplemented(layer) without return types